Irregular cycle

My last period was April 4-7. I’ve had very irregular cycles forever and this isn’t even my longest one. I bought a huge thing of pregnancy tests on Amazon to take regularly just to be able to catch when I do get pregnant. I work in a vet hospital and I want to know asap so I can be sure I’m out of the room if anyone is filling the iso/transferring patients, etc. Anyway, I took a test today and it looks like a faint positive. I have 2 kids already, but not off of long cycles, so for some reason I’m worrying that getting pregnant on a long cycle is riskier. Not having ovulated for over 100 days, would that make my uterus lining more likely to be unstable for a pregnancy? I had 2 early miscarriages before getting pregnant with my first, so I still worry about that. And I don’t have a doctor yet to call and ask all my crazy questions to. Just curious if anyone has ever asked that question before and gotten an answer.